Comments on: Why My Drobo 5C DAS Storage is So Slow?

By: Village Talkies

Village Talkies — Tue, 16 Sep 2025 09:03:14 +0000

Thanks for sharing.
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By: Jon Box

Jon Box — Sun, 14 Feb 2021 16:29:11 +0000

Wow! Your solution worked. My Drobo-5C went from 34 MB/s USB 2.0 to 145 MB/s USB 3.0 just by using another USB-C cable and flipping it upside down. USB Device Tree Viewer is excellent too. 3 days of backup turned into 23 hours.

By: jack Wu

jack Wu — Sun, 01 Nov 2020 16:07:50 +0000

The solution is work
thank you very much to save me a lot of time
And save the “Drobo”. otherwise I will throw it into the rubbish bin

By: Rouj

Rouj — Thu, 10 Sep 2020 04:54:32 +0000

I love your article but still can’t get it to go past 40mb/s even if i use a different pc with usb c. I use usb c to usb c and updated to latest driver, the tool is amazing and show it is usb 2. I contacted Drobo to see if they can find a solution.

By: Andy Young

Andy Young — Wed, 03 Jun 2020 20:43:06 +0000

Thank you so much!

I have finally sat down tonight to try to get to the bottom of this.

My Drobo 5C was always slow on my old PC, and I’ve just put it on a new one with a Super Speed (SS marked) USB port.

I was still only getting 40MB/sec so went hunting for information and found your page. Following the instructions it was indeed only ‘seen’ as a USB 2.0 device by the host.

I shut the Drobo 5C down, flipped the connector in the back of the Drobo the other way up, powered back up and am now getting 220MB/sec!

I cannot believe this isn’t written in 10 foot high letters somewhere in the Drobo guides and the cabel should have a ‘this way up’ marking. It is ridiculous!

Thanks again so much!

By: Jonny Carroll

Jonny Carroll — Wed, 30 Oct 2019 15:10:24 +0000

Try flipping the cable upside down. Fixed it for me. And it was a double sided cable. I think it has to do with the hardware on the Drobo side.

By: Daryn Belden

Daryn Belden — Sun, 29 Sep 2019 01:52:32 +0000

Thanks a lot for this post. I was having exactly the same problem. I even had a “double–sided” USB–C cable so I thought there was no possibility that was the problem but USB Device Tree Viewer showed even that was connecting at 2.0. I tracked down a better cable, verified with USB Device Tree Viewer and my read / write speeds went from 30 MB / second to 135.